We've received a number of e-mails asking how to get into the Basilica without the use of Leonardo's flying machine. However, chances are that you've already penetrated the massive building's defenses in the mission If at First You Don't Succeed.... But if you haven't yet completed that mission, here's how to get to the tomb's entrance.

Go to the northeast corner of the Basilica di San Marco, the huge building in the Dorsoduro district that's shrouded in an ominous red layer. From the northeast corner, you can climb to the top of the building via a series of conveniently placed scaffoldings.

Once on the rooftop of the building, turn west and then south. The entrance to the tomb is located in a recessed area of the rooftop with a ladder leading down to it.

Getting the Seal

As you enter the building, just run down to the east end and activate the puzzle by pulling on the small skull handle. Four short pedestals west of you rise up from the floor, each of which acts as a floor switch that activates one of four "puzzle" challenges. Step on the switch that's closest to you (furthest east) to activate the first challenge.

The camera pans to show you the route you must take in order to get to a switch that drops from the ceiling. The route is pretty straight-forward, and your acrobatics should follow exactly what the camera shows. Climb onto the structures to the east, and from there jump north onto the upper balcony. Continue west on the balcony and at the dead-end you can turn left to jump south across a row of pickets.

Once across the pickets, connect with the southern wall and shimmy left to the southern balcony. From there, you'll need to climb on top of the massive organ pipes, a height from which you can jump and grab the switch that's come out of the ceiling. You should have plenty of time—it's not much of a rush—before the switch recedes back into the ceiling. If the switch does disappear, reset the puzzle via the same floor switch.